SL 110 is a little high for a gravelord. Your best bet is to try your luck at areas that have a high amount of traffic like the Burg (as Wabi stated), the forest areas (after the parish), maybe Anor Londo, and the Township if you have the DLC.

Those are the places you're most likely to be able to gravelord and get some invasions however give it time. Depending on how you gravelord it might take a while before anyone invades you.

My best advice is, if you're looking just for straight up fights, leave your sign in an open area where it can be easily found so the host will be able to invade you easily. If you're more for spreading grief though, hide your sign somewhere or place it by a location where the red enemies would be located at.

I've been gravelording in the forest next to the bonfire sitting there for like an hour and a half and I get like 2 invasions and one of them is a darkwraith and what do you mean 110 too high it was recomended somewhere 100-110 no higher